分布式光纤测温系统在公路隧道火灾探测中 响应特性研究

随着交通运输的快速发展，公路隧道火灾监测与报警越来越重要。目前分布式光纤测温系统已被广泛应用到隧道火灾的监测中，外界风速和隧道断面对火灾监测有一定的影响。该文通过FDS数值模拟和全尺寸实验模拟不同高度的公路隧道发生火灾时，分布式光纤测温系统的报警响应情况。结果表明：在外界风力作用下，传感器的报警位置发生显著偏移；随着隧道高度的增加，分布式光纤感温火灾探测系统报警响应时间延长，可能会不报警。

Response characteristics of distributed optical fiber temperature testing system in highway tunnel fire detection

With the development of transportation, highway tunnel fire detection is more and more important. The distributed optical fiber temperature testing system has been applied in tunnels fire detection, however, the wind and tunnel section have influences on fire monitoring. In this work, FDS numerical simulation and full-scale experiments were carried out with different heights of highway tunnel, in order to examine the temperature-response characteristic of distributed optical fiber temperature testing system. The results showed that sensor alarm points depend on the ambient wind, and the increase of tunnel height leads to the increase of the alarm response time for the distributed optical fiber temperature sensing.